 /*******************************************************************************
  * Copyright (c) 2003, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.osgi.service.resolver;

 /**
  * A state delta contains all the changes to bundles within a state.
  * <p>
  * Clients may implement this interface.
  * </p>
  * @since 3.1
  */
 public interface StateDelta {
     /**
      * Returns an array of all the bundle deltas in this delta regardless of type.
      * @return an array of bundle deltas
      */
     public BundleDelta[] getChanges();

     /**
      * Returns an array of all the members
      * of this delta which match the given flags. If an exact match is requested
      * then only delta members whose type exactly matches the given mask are
      * included. Otherwise, all bundle deltas whose type's bit-wise and with the
      * mask is non-zero are included.
      *
      * @param mask
      * @param exact
      * @return an array of bundle deltas matching the given match criteria.
      */
     public BundleDelta[] getChanges(int mask, boolean exact);

     /**
      * Returns the state whose changes are represented by this delta.
      * @return the state
      */
     public State getState();
 }

